Calculated Industries Construction Master III - Page 26

Roof Covering — Shingles
You’re going to use 12 inch wide by 36 inch
long asphalt (strip) shingles with 5 inch weather
exposure. How many shingles are required for
1745 sq. foot roof? (Note: Shingle exposure area
= Exposure x length, and Number of Shingles =
Roof area ÷ shingle exposure area.)
COMMENTS KEYSTROKES
Clear calculator [On/C] [On/C]
Find shingle exp. area 5 [Inch] [x] 36 [Inch]
[=] 180 SQ IN
Store in Memory [M+]
Enter surface area 1745 [Sq] [Feet]
Divide by shingle area [÷] [Rcl] [Rcl] [=]
Answer: 1396 shingles
Add 10% for waste [+] 10 [%]
Answer: 1535.6 shingles
Roof Covering — Felt
Roofing felt weighing approximately 15 lbs.
per square, typically comes in rolls 3 feet wide x
144 feet long. If the total roof surface area is 2234
square feet, how many rolls of felt are needed?
COMMENTS KEYSTROKES
Clear calculator [On/C] [On/C]
Find area of a roll 3 [Feet] [x] 144 [Feet]
[=] 432 SQ FT
Store in Memory [M+]
Enter area to cover 2234 [Sq] [Feet]
Divide by roll area [÷] [Rcl] [Rcl][=]
Answer: 5.171296 Rolls
NOTE: To calculate the Area of other dimensioned
geometric shapes, see Appendix A.
26 — Construction Master III
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